title: Soil column experiments used as a means to assess transport, sorption, and biodegradation of pesticides in groundwater.
abstract: Soil column experiments are used to investigate the fate of three pesticides of high, intermediate, and low solubility in groundwater: N- phosphonomethyl glycine (glyphosate); O,O-diethyl-S-[(ethylthio)methyl]phosphorodithioate (phorate); (2,4-dichlorophenoxy)acetic acid (2,4-D). Feed solutions are prepared by adding each pesticide (100 mg/L glyphosate, 50 micro g/L phorate, 50 mg/L 2,4-D) along with conservative tracer, KBr, in synthetic groundwater. The concentration of the pesticides in effluents is detected by ion chromatography (glyphosate, 2,4-D) and GC-FID (phorate). The Br(-) breakthrough curves are employed to estimate the dispersion coefficient and mean pore velocity in each column. Solute transport and reactive models accounting for equilibrium/non-equilibrium sorption and biodegradation are coupled with inverse modeling numerical codes to estimate the kinetic parameters for all pesticides.
authors.affiliation: Foundation for Research and Technology Hellas-Institute of Chemical Engineering and High Temperature Chemical Processes, Patras, Greece.
authors.forename: Zoi
authors.initials: Z
authors.lastname: Magga
authors.forename: Dimitra N
authors.initials: DN
authors.lastname: Tzovolou
authors.forename: Maria A
authors.initials: MA
authors.lastname: Theodoropoulou
authors.forename: Theodora
authors.initials: T
authors.lastname: Dalkarani
authors.forename: Konstantinos
authors.initials: K
authors.lastname: Pikios
authors.forename: Christos D
authors.initials: CD
authors.lastname: Tsakiroglou
mesh_terms: D015084:2,4-Dichlorophenoxyacetic Acid / Q000032:analysis / Q000737:chemistry; D000327:Adsorption; D001673:Biodegradation, Environmental; D005998:Glycine / Q000031:analogs & derivatives / Q000032:analysis / Q000737:chemistry; D007700:Kinetics; D010575:Pesticides / Q000032:analysis* / Q000737:chemistry*; D010702:Phorate / Q000032:analysis / Q000737:chemistry; D012988:Soil Microbiology; D012989:Soil Pollutants / Q000032:analysis; D012995:Solubility; D014872:Water Movements; D014874:Water Pollutants, Chemical / Q000032:analysis* / Q000737:chemistry*; D000097797:Glyphosate
chemical_list: D015084:2,4-Dichlorophenoxyacetic Acid; D005998:Glycine; D010575:Pesticides; D010702:Phorate; D012989:Soil Pollutants; D014874:Water Pollutants, Chemical; D000097797:Glyphosate